COMMUNICATION DEVICE AND COMMUNICATION METHOD

摘要

A unique value expansion section (103) calculates a unique value and a unique vector in the correlation matrix or covariance matrix of the input signal. An allocation method selection section (104) selects a sign allocation method for sending a systematic bit in each unique vector if the ratio of the maximum unique value against the other unique value is equal to a below a threshold value. As a result, a communication device (100) transmits the systematic bit X in each unique vector. On the other hand, the allocation method selection section (104) selects a sign allocation method for sending the systematic bit only in the unique vector of the maximum unique value if the ratio of the maximum unique value against the other unique value is greater than the threshold value. As a result the communication device (100) sends the systematic bit X only in the unique vector of the maximum unique value. Thus, in the communication system using the turbo sign and MIMO in combination, it is possible to improve the communication quality even if there is a great difference between the maximum unique value and the other unique value.